IF just each panels of judges could make an effort to try to unify the numbers (as they used to do under 6.0 system at the starting of each group),
You could get each panel to unify the numbers for the first skater in their qual round, same as was done under 6.0. They all have the same first skater to use as the benchmark.
It would be a lot trickier to get each separate panel to unify numbers for the different skaters in their different qual rounds. They're not looking at the same thing.
Do you take a standardized average juvenile skater that every judge in the country has to watch on video and be told "This is 2.5 for Skating Skills, 3.0 for Performance/Execution," etc.? But what about when the first skater in their qual round is better than the reference video at some aspects of Skating Skills and worse at others? Then it will still be up to each judge to decide whether they still want to give 2.5 or to go higher or lower. And so forth.
I think that over time the standards become somewhat more consistent between judges within the same region, and eventually across the country, as judges see the same kinds of skating over and over and start to develop consensus about how much things are worth. But you still have individuals making decisions based on their own perceptions and their own prior experience, which are never going to be identical. PCS will still always be decided by human judgment.
If you only made the cut based on TES, it would be more standardized and less subject to human opinion. But then you could end up with the cut being made purely on which elements were successfully attempted, and not on the overall quality of skating and performance.
And there will still be
some variations in TES ranges between different panels with different officials:
Even GOEs, with more objective criteria for the negative GOEs and a narrower total range of possible numbers to assign, will never be completely mechanical. As long as quality is being measured, there will be some differences of opinion.
And some technical panels are stricter about the gray areas than others.